Online CSS optimizer tool
When you decide optimize your CSS file, you can chose “Optimize CSS via URI” (online file), “Optimize CSS via File Upload” (CSS from your computer) or “or Optimize CSS via Direct Input” (by copy/paste file into online form). You can also chose if you want CSSoptimizer remove line breaks in your file or not.
Firebug-webmasters a must tool
Seomoz SEO tools collection
TermExtractor analyzes content of a given page and extracts the terms that seams to be targeted at search engines. CrawlTest discovers the problems search engine bots run into while crawling your website, the http response codes your pages return, cache dates, title tags and much more. GeoTarget determines how well a site is targeted to region-specific search engines.